On Sat, 8 Sep 2007 18:16:12 -0400, "Bob D."
wrote:

I bought an MFJ-269 antenna analyzer with some 160 meter antenna design in
mind. It works fine on my VHF and UHF antennas, but the local 1350 AM
station (which is just a half mile away) interferes when an HF antenna is
connected. The SWR reads 31 and the two analog meters dance to the
station's audio. I tried a home made 1350 KHz notch filter I've used with a
few receivers. The notch filter gets rid of the offending signal, but makes
the 160 and 80 meter readings bad (verified with a dummy load).

Any solutions out there? Is it possible to build a 1350 KHz filter that
won't throw off the impedance reading at 1800 KHz?

Luckily my Kenwood TS-570 is able to contend with the AM station.

If you're open to getting another analyzer here's one to consider. I
have used my AIM 4160 at a friends location which is about ½-mile from
a local broadcast station and it worked fine for 160-metrer antenna
adjustments -although the local BC station runs only 1 KW.

Here's a link showing what you can expect using the analyzer for your
situation.

http://w5big.com/AIM4170_SignalRejection.htm

Danny, K6MHE